Human Nutrition Lecture 4 - Human Nutrition Lecture 4...

Human Nutrition Lecture 4 Digestion, Absorption, Transport Blood Flow:-most tissues: heart to tissues to heart to lungs to heart -intestines: heart to intestine to liver to heart The Hormonal System • When pancreas detects high glucose, secretes insulin and insulin stimulate muscle to uptake glucose and glucagon is the opposite process The Nervous System • Digestive system shuts down to prioritize muscles (metabolism speeds up) Mechanical Digestion-mechanical and chemical process-chewing and peristalsis…water added for peristalsis in stomach, small intestine, and you reabsorb water in the large intestine The Muscular Stomach-sphincter, muscle layers, folds ,and pyloric valve Chemical Digestion-salivary enzyme that breaks down starch and little milk fat-stomach: secretes gastric juices (water, enzymes, and HCl) and intitiates protein degradation (proteins unfold (denatured) and clipped into shorter pieces pH Values-see slide Small intestine • Bile made in liver and it is responsible for emulsifying your fats • Pancreatic juice is secreted for digesting protein, carbohydrate and fat • Small intestine produces its own enzymes for digesting protein (di- and tri-peptides) and carbs (disaccharides) but not fat Large Intestine

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